## 1.NBT.B.2

## Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

28 Lesson(s)

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#### CSI First Grade! Today your young investigators will try to find the missing addend while playing two different missing addend games.

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#### Students head to the Lego Factory to build orders using what they know about base ten!

#### Students get hands on, minds on experience with counting, while also constructing understanding of tens and ones.

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#### Students use their understanding of base 10 to make coin counting a breeze!

#### Students have been learning about tens and ones. This day allows them to apply what they know to a "real life" farm crisis! The chickens have laid a bunch of eggs and students have to figure out how many the farmer is collecting!

#### Students bring together all of their understanding about counting and base ten with this summative activity!

#### The Number Grid Challenge. Students will play a game that requires them to add or subtract ten from a number using the number grid. They will record their results using standard notation.

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